rjw | 1f88458 | 2022-01-06 17:20:42 +0800 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright (c) 2013 Travis Geiselbrecht |
| 3 | * |
| 4 | * Permission is hereby granted, free of charge, to any person obtaining |
| 5 | * a copy of this software and associated documentation files |
| 6 | * (the "Software"), to deal in the Software without restriction, |
| 7 | * including without limitation the rights to use, copy, modify, merge, |
| 8 | * publish, distribute, sublicense, and/or sell copies of the Software, |
| 9 | * and to permit persons to whom the Software is furnished to do so, |
| 10 | * subject to the following conditions: |
| 11 | * |
| 12 | * The above copyright notice and this permission notice shall be |
| 13 | * included in all copies or substantial portions of the Software. |
| 14 | * |
| 15 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, |
| 16 | * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF |
| 17 | * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. |
| 18 | * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY |
| 19 | * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, |
| 20 | * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE |
| 21 | * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. |
| 22 | */ |
| 23 | |
| 24 | /* |
| 25 | * Global init hook mechanism. Allows code anywhere in the system to define |
| 26 | * a init hook that is called at increasing init levels as the system is |
| 27 | * initialized. |
| 28 | */ |
| 29 | #include <arch/ops.h> |
| 30 | #include <lk/init.h> |
| 31 | |
| 32 | #include <assert.h> |
| 33 | #include <compiler.h> |
| 34 | #include <debug.h> |
| 35 | #include <trace.h> |
| 36 | |
| 37 | #define LOCAL_TRACE 0 |
| 38 | #define TRACE_INIT (LK_DEBUGLEVEL >= 2) |
| 39 | #ifndef EARLIEST_TRACE_LEVEL |
| 40 | #define EARLIEST_TRACE_LEVEL LK_INIT_LEVEL_TARGET_EARLY |
| 41 | #endif |
| 42 | |
| 43 | extern const struct lk_init_struct __lk_init[]; |
| 44 | extern const struct lk_init_struct __lk_init_end[]; |
| 45 | |
| 46 | void lk_init_level(enum lk_init_flags required_flag, uint start_level, uint stop_level) |
| 47 | { |
| 48 | LTRACEF("flags %#x, start_level %#x, stop_level %#x\n", |
| 49 | required_flag, start_level, stop_level); |
| 50 | |
| 51 | ASSERT(start_level > 0); |
| 52 | uint last_called_level = start_level - 1; |
| 53 | const struct lk_init_struct *last = NULL; |
| 54 | for (;;) { |
| 55 | /* search for the lowest uncalled hook to call */ |
| 56 | LTRACEF("last %p, last_called_level %#x\n", last, last_called_level); |
| 57 | |
| 58 | const struct lk_init_struct *found = NULL; |
| 59 | bool seen_last = false; |
| 60 | for (const struct lk_init_struct *ptr = __lk_init; ptr != __lk_init_end; ptr++) { |
| 61 | LTRACEF("looking at %p (%s) level %#x, flags %#x, seen_last %d\n", ptr, ptr->name, ptr->level, ptr->flags, seen_last); |
| 62 | |
| 63 | if (ptr == last) |
| 64 | seen_last = true; |
| 65 | |
| 66 | /* reject the easy ones */ |
| 67 | if (!(ptr->flags & required_flag)) |
| 68 | continue; |
| 69 | if (ptr->level > stop_level) |
| 70 | continue; |
| 71 | if (ptr->level < last_called_level) |
| 72 | continue; |
| 73 | if (found && found->level <= ptr->level) |
| 74 | continue; |
| 75 | |
| 76 | /* keep the lowest one we haven't called yet */ |
| 77 | if (ptr->level >= start_level && ptr->level > last_called_level) { |
| 78 | found = ptr; |
| 79 | continue; |
| 80 | } |
| 81 | |
| 82 | /* if we're at the same level as the last one we called and we've |
| 83 | * already passed over it this time around, we can mark this one |
| 84 | * and early terminate the loop. |
| 85 | */ |
| 86 | if (ptr->level == last_called_level && ptr != last && seen_last) { |
| 87 | found = ptr; |
| 88 | break; |
| 89 | } |
| 90 | } |
| 91 | |
| 92 | if (!found) |
| 93 | break; |
| 94 | |
| 95 | #if TRACE_INIT |
| 96 | if (found->level >= EARLIEST_TRACE_LEVEL) { |
| 97 | printf("INIT: cpu %d, calling hook %p (%s) at level %#x, flags %#x\n", |
| 98 | arch_curr_cpu_num(), found->hook, found->name, found->level, found->flags); |
| 99 | } |
| 100 | #endif |
| 101 | found->hook(found->level); |
| 102 | last_called_level = found->level; |
| 103 | last = found; |
| 104 | } |
| 105 | } |
| 106 | |
| 107 | #if 0 |
| 108 | void test_hook(uint level) |
| 109 | { |
| 110 | LTRACEF("level %#x\n", level); |
| 111 | } |
| 112 | void test_hook1(uint level) |
| 113 | { |
| 114 | LTRACEF("level %#x\n", level); |
| 115 | } |
| 116 | void test_hook1a(uint level) |
| 117 | { |
| 118 | LTRACEF("level %#x\n", level); |
| 119 | } |
| 120 | void test_hook1b(uint level) |
| 121 | { |
| 122 | LTRACEF("level %#x\n", level); |
| 123 | } |
| 124 | void test_hook2(uint level) |
| 125 | { |
| 126 | LTRACEF("level %#x\n", level); |
| 127 | } |
| 128 | |
| 129 | LK_INIT_HOOK(test, test_hook, 1); |
| 130 | LK_INIT_HOOK(test1, test_hook1, 1); |
| 131 | LK_INIT_HOOK(test2, test_hook2, 2); |
| 132 | LK_INIT_HOOK(test1a, test_hook1a, 1); |
| 133 | LK_INIT_HOOK(test1b, test_hook1b, 1); |
| 134 | #endif |